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Segment Information - Results of Operations and Selected Financial Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Net interest income (expense) $ 45,489 $ 40,630 $ 87,518 $ 80,886  
Noninterest income 23,611 21,733 47,173 44,268  
Income before taxes 20,114 19,392 40,651 39,939  
Total Assets 6,368,633 5,749,666 6,368,633 5,749,666 6,038,974
Operating Segments [Member] | Metropolitan Banks [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 15,372 13,943 29,159 27,954  
Noninterest income 3,463 3,116 6,876 6,306  
Income before taxes 7,484 8,108 15,274 17,045  
Total Assets 2,142,031 1,945,032 2,142,031 1,945,032 2,079,444
Operating Segments [Member] | Community Banks [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 28,955 25,424 56,196 50,568  
Noninterest income 12,973 11,846 25,239 23,391  
Income before taxes 17,692 14,512 32,769 28,589  
Total Assets 4,087,728 3,590,420 4,087,728 3,590,420 3,764,429
Operating Segments [Member] | Other Financial Services [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 1,568 1,730 2,944 3,295  
Noninterest income 6,329 6,073 13,385 12,975  
Income before taxes 2,292 2,158 5,358 5,395  
Total Assets 116,343 93,047 116,343 93,047 103,656
Operating Segments [Member] | Executive, Operations & Support [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) (406) (467) (781) (931)  
Noninterest income 15,919 13,792 31,874 28,541  
Income before taxes 7,680 7,643 17,359 15,737  
Total Assets 657,743 706,501 657,743 706,501 703,294
Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 0   0    
Noninterest income (15,073) (13,094) (30,201) (26,945)  
Income before taxes (15,034) (13,029) (30,109) (26,827)  
Total Assets $ (635,212) $ (585,334) $ (635,212) $ (585,334) $ (611,849)